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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '060837376dbc817988889a366aba8b00117dd6f224cf82513144be6e92b0eb3a' 
  AND token = 'LS1TEft1x3gqpg6uwq4Lih/hdl4ZQCzye14ExmjQuDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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