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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2dec402ceec32ff370ad5ffedcc007a845b6bcab80c7ee9abfddcc43a28e583' 
  AND token = '0b4zi0z0yzafLWoGmgc5TztFGdXdMOhforD3swS4kWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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