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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e03bdec63ad86ec5f5ce2d48fea2a5f4757ea7a4d5a9497694dc812947847e89' 
  AND token = '0RTmzLyS39RtH9YclpcFuF8xVkNigZCAlbw3Pr6p9Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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