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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b0c09a828726230d63b5ea7a6675484516f2d092db68f2cdf4e1051242778826' 
  AND token = '51M0aKA7zR2Xsd0CKc37fXfGTQp9iMZEQY0/6F34YyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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