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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ee0827b2a50b537ebf09fb78382423d04b13f14882a7136cb94d36cb377601d' 
  AND token = 'kOGeUpldGwn50SSodgYUd4TpuMuXY9ZCaLAi3KdCtuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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