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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '46f0df73682939f77f5d0937c0d609435c5a389e9bacfd98cd375778fcf75392' 
  AND token = 'mp/YkcwXZvuCvRQYc4/kaU9ELCNkNLIs/U0eUtXv5/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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