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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebe9b9c3f1cd818ddfea965cc4790765daaae3964796440e9dc612f7188637f0' 
  AND token = 'kyOc8Us4OKVsK7hfcXZCWTJ/LNeQ9LyQidvoR+9eJz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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