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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '04b5de340be07d9b5f250c2a9553c0dcfa5ddad11c9141f653c55c00f7c54d45' 
  AND token = 'RFLJo7jfHmErL+vZJbAAr+PZ3KpTm3RG3vU6J5vBIRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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