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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b07982f265a4ebd4c06a0cdb4c93d09690cce6c23ffdc727c6ae419d2a06dd18' 
  AND token = 'F77oIpC8KhJ4ek4v4y3Lb/5R9ZrsqcOIMzEZxbcdrE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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