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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55245f58811f6b50db97028dc147bab49ac37ca535ae568a468d117022926290' 
  AND token = '6Tp7TXdJzSvtXxbCMqMCo5Da5cW6FjgLswke3/iutPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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