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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bca3d570d3eb6eeeb580bd2b90bbf1999a4cbb4b8a2a31eaebb471f272c826bb' 
  AND token = 'zv93AYGVo1s4XWW4Ay3dgu4JF+Wi0HwrwoRkww+IF7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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