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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '96747cdb286da9047fb4d117638dac6aa315ef7494ba67c1892ff89bfc2d0b19' 
  AND token = 'SxMF7eT+Tnu3j1bx7kCy3zrJTyTPIdWrVdkTOQqdKS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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