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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd19d0c90c9207ddf8f7de88a265f608e0fc11bf1a3e82d4d1210aee6d4348509' 
  AND token = 'fAjd89VoXss61wa1l96lOVHCTtekDCg3u+pD8mcKpRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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