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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8014b806006bce1114e23fc72d445c90b413914c0b3c9edd1eb72b1b873ba7a1' 
  AND token = 'UB2lP8QwiwCGrGTAOUBMgy+m0BjhQeLUnR7DWGX6g+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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