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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f3876836edf4e9c92bef1986d4dc113e87eb9a1d8b66e4e19f9d4039356a73b9' 
  AND token = 'fLfcMApQvtZnyBcMNuY74n7me3AalCG1ADD+Zb22oPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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