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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '74bcfe4f498c6639bc6a2f6b1547080d104b09e2f6410253445c5db74b0397f2' 
  AND token = 'QRUkRPoUf9OFjdSoPmEG7+S6Wpi5+fcjPfbCtYpTAKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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