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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0012bce47b95746b6e5614886c02906c294babfc210ee2718980fce968b9df53' 
  AND token = 'pxp/uuSmb8z3qOSE2UMggvtN/0Hiyc8Ll/ye7yXT33w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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