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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd1c04d16d532ffcadd8d9f2bae4940951b703216249e16826ef6a2c33c5239e6' 
  AND token = 'ccAcQVVwKw8ScmLZiDLOZaNK7qP7dnDWW9689BPu1xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00319

JSON explain

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