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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20d3b043e755f116261e80cee7d1d815ee6e1902caf8a8828f1a9aed689979f3' 
  AND token = 'FEPHR22pPwBthW3XBx+rIp+N7QACFYlk0y4J3HU+z+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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