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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b4b717aec7be594fba3a94fadd2ecdd127b925badf5d527c6302fc3625eda047' 
  AND token = 'fy2bK3frJyh60G1Y8bpQt0krU5yiPFmYAMItv7I3CQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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