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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2846eadedaa208f5029ecdb537a6480e96624cc2735459d09885a488b0241405' 
  AND token = 'LydjijQ+soBYdA0EOnAC3s0f/f3dFqhqEhda0I6Vc/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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