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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '775cb38ba2da40684495cab173f77cb2826e0ce2fb2fb7fc9aad5c09b339b8a8' 
  AND token = 'I4nfc+0s+ELEsJbt3uyfZUCAFycJcMJ92m2m1cdhJmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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