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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'df22a03bf392f1f5af4c142e903d764b8111cf8e921fc2167337ba541b7db22d' 
  AND token = 'Kzu+k5j6sFjEDLZ5kEnS5TmVFEQWi58+zweK3VDH5HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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