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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa888b2f1502c97aedc7790e9391843335be79ad87957bea6d703b8eb41494f7' 
  AND token = 'btxPwqsHM64TGgldRkF2ryGhaLVcM3IQwoZge+9ACN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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