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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c3953ce936158c03e16701a8704627351fa72d2a4157c8291cdc0cf69fc1bc8' 
  AND token = 't/Bce+eHG0THScvJxsxdGtuB+Eoav7gjQ7cA8OFzK4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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