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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '000b0122ffc88dbfa76cac918fe82a74459469ac3f5b2cd2ba0efb46f203cd31' 
  AND token = '1lNzzfmrqjWUVswE4Pviwe888m13K4cBya/Hc262NKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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