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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfddc78e5eb85a9e70b81c27a5be6e2f4c138d700182f4a5755468bb0dd53c44' 
  AND token = 'hQQicVB99gvqDl5Qr2QEkOIR1MFKoSP6CyU4bemdzs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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