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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1b801c36821d221198a866889974fc42b6b31bc0b3486300f9bd6e6cb136716' 
  AND token = 'Aaf3Q9UJ5nIIUjRn0R+25FZCg3lg99djCXQvcGXjTng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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