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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a41163e08bfce71241af9b9795929aa115774b48d6b306b00cb1a3acd0513f4f' 
  AND token = 'yS/MiUrJr49/iBbCkRDJ6fKnc1IisRBxZ7dt/w1Qc6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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