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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '97cceaa8d0b776bfc8f26bc5c0761d755d27dcd78f55755e5e6b33c70104383e' 
  AND token = '1OMolHBEMgOFR/1NSMNLTtUatEGIYes4xrCrmonlQoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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