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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc68c67442c40b773fd41adac3eb449aebc628d83a6c6cd2c601b146499307f9' 
  AND token = 'f3VuhF3J9Q9M3disNuczPNiUune829wHdQfeu869kBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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