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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2eb52d8acdf494b7cd54e1215ab04bb76bd3ac44d70712970cfd180594f7e96f' 
  AND token = 'r+M16vcsP5HGVRCRgs7nX7aRjGY51krxQBG3iAdRQms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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