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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '36ba27a5e586ab8abe12470be1ea00ad5c0d3b62e5e59d63b02a25baeace35fb' 
  AND token = 'N5zgXOrwc81+fHK57V0lgqgcDHtkB7LK1i9w8JiY/SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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