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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f077de20554641a0f67e7051d35b1685df8133aa9e16f93e5526d42fbb559293' 
  AND token = '1aBaMjl7Ak0LyraQMUEw1k5/41B7QuNx89I1qfgTa68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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