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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81f0cd8c3fd76ac740c8a2b7d6e489f0220ca663a6d2db0cc907d54081f6286b' 
  AND token = 'R+H6f8540/ZkNnfrQbABFBp4HUOc7hhiz3XEv2T54A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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