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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1dbb754fb957cd80dffa0fb8c0e903b6ce3d77640f78d8e58b3171e28bd72124' 
  AND token = '0R+rn2+A1A7rET9Q5MQ2/qj9AdRnCUTCzb5btGQjkm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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