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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '493be50efd1621ee69b8beca238c5ec642f7ec47b0e277e2ddeadef7048846af' 
  AND token = 'kPWK7NZgFBTMxoo6NAYArgNaXZMgc5TfzqDz3pk2G4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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