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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cee4d09e7f8b0c67d4a708e81bdcddeaefdd1e7e64443db9a647ec10982ed136' 
  AND token = 'RF6IA9PKTfdnlZlSU+MwP/9BFfnNOFe84r1Qv3uGYD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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