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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73175fa3434e66442f35e559426fd78cceb3eec31120c1f2ea4731995d6fb46b' 
  AND token = '/IeUnvyvWeTxv0VufRC2S6Prbf3q7gGWnx1GuQYViyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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