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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1a590de294215dcb07753f1da76856022cbf1e7b585927b7cffad1b69d85e05' 
  AND token = 'oFudEk3gUBiRNSLFhIc2J+iFx+ogWJ36F9IrhuHzQY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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