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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53e453b56bcc599b69ce06941394a0a23e3e18dcc3ed0eca3d2f635ff0960f98' 
  AND token = 'eGjVM5ZfAdbbH/+JxyxXnmt2MEE6yi7/nMTrm4wEukY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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