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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e776ad5c415c2b6bbdae4db3ff5d5c700750f5a4069278e6316ee420c5228d11' 
  AND token = '2edottbghistROje1MCT8caSOAlpUta4UY6ZZHG3T/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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