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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f26282a32f94093aa1dbc1b505a3a9d7e91b5faf319ca4b13b15ef404e403d02' 
  AND token = 't9OF+iln5h1nE4Rt7xiJ2dNmE2yJeUZ5oqa20Sj2/7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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