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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7a2100074c3646bf74bb7140e3501f0666770e3033e668472b9b1c9bb1e6fecb' 
  AND token = 'rtHxuD+cny88Col+PdjqnoSbV0ZLZ/8mocB2AzU3CRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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