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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '763774a877665f05b4f5f508a49203ddb5e075874b6bb122e1d44d7054cfd4dd' 
  AND token = 'KzIuF7i37+XPo+FmikLU4qCX2MVUpJuqP6tusUCYkr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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