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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27fd6653f6e1c6fc69451f6974656c25b64ae908a54a241560eea446092da062' 
  AND token = 'U7t8wGGBkg+C+39euTeLDs2OK+AhiU7MpBw0dSG3bxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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