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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '144f3df4df8f788e16800fe30cc496c1153013830d9ef74fffcc78fe5b759c7d' 
  AND token = 'ak//ftvMhv7c6iier6lzq0SoHJnPdjhDTWGxK+STaH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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