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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b3946c152babc18a2f7f7cf1f1fb7e12d22b92549c9a5534952b409548f2d2c' 
  AND token = 'sYIT2OGNnjcmnjuANh7MHShiUqHCCcrzLH8p2/y6Du0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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