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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e96c3ad8b3daa7d3a2f2e33ccae4fb5038df3c03934222719f10349ef0d6247e' 
  AND token = 'd+E6dQJHxjGfSbv9H5LHP/cWiCCSKyvcQxwN0ndjMuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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