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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '594d4cfe5cd47ea8da880b401749948894e6b1844cf687edc69accb7119fbd34' 
  AND token = 'RvfjxlJMlCIdGxLoXRYeiqd1sf/ujKNu5exH9bd+fUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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