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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63972c5cba5b28acd9c746c65c1a1bc789e1298bcf340d3b74eca775420c4676' 
  AND token = 'k18DL8/2eNF8aXr2RpNJbybMibkYhwx4hF6vBYBh9Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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