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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09d8a23276d3afd1dbb0393e38dc22c87024c34a3d3c8c98baf1e7d539b6a2e4' 
  AND token = 'EakLx2Bhek6TDUpv+JAE1IpLJTs8fjW/4pWsnwm8JUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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