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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '184fecacbc7d25bda56ba5a133909bf068a6a1459c0cf2c9408c80d2c9b02638' 
  AND token = 'PhieuaRGsFF7GdTId2ye7nAqUdWseT7vig3AWV1kSLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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