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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92779d405d85553ddb59c53c4f4f60f1f10f9c16ee7634683e2504a9b8d7f647' 
  AND token = 'Gx/idt2SjEIAaN8leCIE7xPNec3qnILN/c5ejcfitfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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