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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '16dceb69dd75b6ea83e0072892dbcfa7a91e25ad78bf6ce7e0f5981197404d8f' 
  AND token = 'yzf7eyITB87+4dzH2JjI2Q6EjlxxC2CKOvwK+lkraLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}