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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5991a54435982f5029822fb915e2343d6a2f097e70123267158b3419aaee4de5' 
  AND token = 'Zaz5/a/iaRXbeZ5KRc9aa2djlEf2r7sG46OadXsuKyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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