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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '11b74d486d0e76cb1a0c63be386c1730121d426673849f5c6b872c5c7c47a9be' 
  AND token = 'X5Ym74GQ0i0SdzZARdNAgstOYukXaDqT8zc53srghA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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