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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '33f4a1ea5f4d5f1d0aca60169c27870f8790fcdb4777d8b5e3c1a0d26497a1f5' 
  AND token = 'kj8iqyyBAoeUll0TIBsBpB3Fm6Ayp6OKH2yiv6uVSPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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