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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '964efc1c4b897b26a81e2fbfce0d2f832cd6af7266897d30d779dd108a4e3f8e' 
  AND token = 'BIcnbT0tLriy3sMe1UtKgxyRFybRt2XMeW+rHCDUdp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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